Heads
HDF Community Team
Joined: Jun 2006
Posts: 12,763
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From: san antonio
I have to ask, for $500, why not have your heads ported? The end result will be better.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
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From: poway
Yes but know that those heads have been decked to produce 10.5 static CR with OEM pistons, so, if running aftermarket cams with earlier intake close events, you need to watch CCP. You will also need '06 up intake flanges, PN 26993-06. The springs in these heads will accommodate up to .585" lift by the book but might work up to .600" if checked for coil bind first.
I have to ask, for $500, why not have your heads ported? The end result will be better.
I have to ask, for $500, why not have your heads ported? The end result will be better.
They are pretty much stock later heads that have been milled a bunch and heavier springs added. Better options out there for sure.
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
Actually they are probably about only 9.5 to 1 with stock 88 ci pistons.. According to the 2010 catalog the need high compression pistons to get 10.5 out of an 88.. On a 95 motor they only squeak out 10 to 1 with flattops.. They do get 10.5 out of a 103 tho.. They are pretty much stock later heads that have been milled a bunch and heavier springs added. Better options out there for sure.
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Road Master
Joined: Feb 2015
Posts: 1,040
Likes: 203
From: Susanville CA
Thanks you guys I was just curious about those. I will most likely have my stock heads ported and new valves put in
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With a bore to 98"/mild headwork, those .509's will really push the torque, if that is what you are after. 
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3rd Gear
Joined: Jan 2018
Posts: 7
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From: Motorcity
Heads
Would it be worth the cost to purchase a set of 07 heads and have them ported & polished for my stock
2001 EG . I enjoy my fuel mileage Just not ready to start messing with this MM injection system yet
thanks in advance for helpful information
2001 EG . I enjoy my fuel mileage Just not ready to start messing with this MM injection system yet
thanks in advance for helpful information
Kompressor heads are just stock heads milled with springs to accommodate a cam.
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